866762381 has 4 divisors (see below), whose sum is σ = 874863072. Its totient is φ = 858661692.

The previous prime is 866762341. The next prime is 866762389. The reversal of 866762381 is 183267668.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 866762381 - 2¹⁸ = 866500237 is a prime.

It is a super-2 number, since 2×866762381² = 1502554050233578322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866762389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4050185 + ... + 4050398.

It is an arithmetic number, because the mean of its divisors is an integer number (218715768).

Almost surely, 2^866762381 is an apocalyptic number.

It is an amenable number.

866762381 is a deficient number, since it is larger than the sum of its proper divisors (8100691).

866762381 is a wasteful number, since it uses less digits than its factorization.

866762381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8100690.

The product of its digits is 580608, while the sum is 47.

The square root of 866762381 is about 29440.8284700006. The cubic root of 866762381 is about 953.4545991301.

The spelling of 866762381 in words is "eight hundred sixty-six million, seven hundred sixty-two thousand, three hundred eighty-one".